Step-by-step explanation:

f (x) = x - 5

g (x) = 3x + 18

(f + g)(x) = f (x) + g (x)

(f + g)(x) = x - 5 + 3x + 18

(f + g)(x) = 4x + 13

(f - g)(x) = f (x) - g (x)

(f - g)(x) = x - 5 - (3x + 18)

(f - g)(x) = -2x - 23

(f - g)(2) = -2 (2) - 23

(f - g)(2) = -4 - 23

(f - g)(2) = -27

I hope this helps